Online mess up

this airline has a serious problem with the way they treat their customers I booked flights online and somehow the date got mixed at first I was too blame then when I was in the line to get a new ticket I found 7 people with the same problem with the same date mix up, when I asked the lady from mango her attitude was so bad I just walked away before I lost it and made matters worse the service of this airline is very poor. the flight delay I had on this same trip was the worse and not even a simple apology was made I got an sms 3 days later saying sorry. this airline needs a wake up call